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Supplemental Information on Oil and Gas Operations (Unaudited) (Costs Incurred) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Property acquisition costs: |  |  |
Proved properties | $ 7,017 |  |
Unproved properties | 2,381 | $ 8 | $ 35
Exploration costs | 212 | 159 | 312
Development costs | 1,643 | 820 | 1,499
Costs incurred | $ 11,253 | $ 987 | $ 1,846

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